1、 MIL-DTL-49285/25A 1 March 2010 SUPERSEDING MIL-C-49285/25 19 October 1989 DETAIL SPECIFICATION SHEET CABLE, SPECIAL PURPOSE, ELECTRICAL, FIFTEEN INDIVIDUALLY SHIELDED PAIRS OF 20 (10 X 30) AWG This specification is approved for use by all Departments and Agencies of the Department of Defense. The r
2、equirements for acquiring the product described herein shall consist of this specification sheet and MIL-DTL-49285. FIGURE 1. Cable illustration. AMSC N/A FSC 6145 INCH-POUND Inactive for new design after 16 June 1997. Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
3、nse from IHS-,-,-MIL-DTL-49285/25A 2 Engineering information: See table I. Note: Not for aerospace use. TABLE I. Description, electrical. Electrical characteristics Requirements Nominal capacitance between conductors Nominal capacitance between the conductor and the shield with one conductor tied to
4、 the shield Continuous working voltage Nominal capacitance between adjacent shields Continuous working voltage between adjacent shields Shield dc resistance 30 pF/ft (picofarads/foot) 55 pF/ft 350 V rms maximum between conductors 150 pF/ft 50 volts maximum 14 ohms/1,000 feet maximum TABLE II. Descri
5、ption, physical. Components Construction details Number of conductors Conductor type and wire size Conductor stranding Conductor insulation Conductor insulation thickness Drain wire type and size Drain wire stranding Jacket material Jacket thickness Finished cable diameter Cable style (UL) Tensile s
6、trength (jacket) Elongation (jacket) Overall cabling lay lengths Fifteen individually shielded Stranded tinned copper 20 AWG 10 X 30 AWG Polypropylene 0.013 inch nominal thickness Stranded tinned copper 22 AWG 16 X 34 AWG Polyvinyl chloride 0.050 inch 0.688 inch maximum outside diameter 2493 2,000 p
7、ounds per square inch minimum 150 percent minimum 1.3 twists per foot 10 percent Cabled pair orientation: The position of the red and green pair shield shall determine the rotation direction for pair location (see figure 1). Provided by IHSNot for ResaleNo reproduction or networking permitted withou
8、t license from IHS-,-,-MIL-DTL-49285/25A 3 TABLE III. Shield color code. Pair numbers Shield color Center core 1stpair 2ndpair 3rdpair 4thpair Outer layer 5thpair 6thpair 7thpair 8thpair 9thpair 10thpair 11thpair 12thpair 13thpair 14thpair 15thpair Red Green Blue 1 Blue 2 Red Green Blue 1 Blue 2 Blu
9、e 3 Blue 4 Blue 5 Blue 6 Blue 7 Blue 8 Blue 9 REQUIREMENTS: Design and construction: (see table II): Shield location and orientation. The polyester aluminum shield is to be located on the outer circumference of the pair, with the aluminum foil side outward. Insulation on the interior of the shield i
10、s to be complete with no aluminum available for contact. Drain wire location. The drain wire is to be spirally located between the noise reducing tape and the aluminum foil shield, and is to be in continuous contact with the aluminum surface of the foil shield and the noise reducing tape throughout
11、the cable. Cable temperature rating. The cable temperature rating shall be -20C to +80C. Flammability. The cable shall pass UL 2556 flame test requirement. Shield integrity test.* Frequency Response * 100 kHz 112 dB below reference 500 kHz 107 dB below reference 1 MHz 101 dB below reference 5 MHz 86
12、 dB below reference 10 MHz 81 dB below reference 15 MHz 76 dB below reference 20 MHz 71 dB below reference 25 MHz 66 dB below reference 30 MHz 62 dB below reference * Any two readings may deviate to a value of 0.9 times the stated limits. * All values are a minimum numerical value. Provided by IHSNo
13、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-49285/25A 4 Fixture resonance will occur between 40 and 70 MHz. At 100 MHz: At least 40 dB below reference. Crosstalk test limits. All values are minimums. Frequency (kHz) Near end crosstalk (dB) Far end crossta
14、lk (dB) 40 57 58 70 52 53 100 44 50 1,000 43 44 Insulation resistance between shields: 100 megohms/1,000 feet (minimum). Durometer hardness. The cable jacket shall have a “Shore A” hardness of 82 5. Part or Identifying Number (PIN): The PIN shall be M49285/25. Changes from previous issue. The margin
15、s of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the re
16、quirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Referenced documents. In addition to MIL-DTL-49285, this document references the following: UL 2556. CONCLUDING MATERIAL Custodians: Preparing activity: Army CR
17、 DLA - CC Navy SH Air Force 85 DLA CC Review activities: Army MI (Project 6145-2009-012) Air Force 71 DLA - IS NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change. You should verify the currency of the information above using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
